Grégory Gadebois (born 24 July 1976) is a French actor.

Before starting his acting career, he worked as a mover.

He studied at the CNSAD in the class of Catherine Hiegel and Dominique Valadié. From 2006 to 2012 he was a member of the Comédie-Française.

In 2012 he received the César Award for Best Actor for the film Angel and Tony directed by Alix Delaporte. He received two more nominations: first in 2013 for Best Actor for the film One of a Kind, and then in 2019 for Best Supporting Actor for the film The Officer and the Spy.